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/** Append an object to the end of the list. * @param o the object to append */ public void append(Object o) { LLCell n = new LLCell(o); if (length == 0) { head = tail = n; length = 1; } else {
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/** Insert an object at the head of the list. * @param o the object to add */ protected void insertHead(Object o) { LLCell c = head; head = new LLCell(o); head.next = c; length++; if (tail == null) tail = head; }